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PCA9546ADW Datasheet(PDF) 6 Page - Texas Instruments |
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PCA9546ADW Datasheet(HTML) 6 Page - Texas Instruments |
6 / 29 page www.ti.com I 2C Interface SDA SCL Data Line Stable; Data Valid Change of Data Allowed SDA SCL Start Condition S Stop Condition P SCL Master Transmitter/ Receiver Slave Receiver Slave Transmitter/ Receiver Master Transmitter Master Transmitter/ Receiver I2C Multiplexer Slave SDA PCA9546A 4-CHANNEL I2C AND SMBus SWITCH WITH RESET FUNCTION SCPS148E – OCTOBER 2005 – REVISED JANUARY 2008 The I2C bus is for two-way two-line communication between different ICs or modules. The two lines are a serial data line (SDA) and a serial clock line (SCL). Both lines must be connected to a positive supply via a pullup resistor when connected to the output stages of a device. Data transfer can be initiated only when the bus is not busy. One data bit is transferred during each clock pulse. The data on the SDA line must remain stable during the high period of the clock pulse, as changes in the data line at this time are interpreted as control signals (see Figure 4). Figure 4. Bit Transfer Both data and clock lines remain high when the bus is not busy. A high-to-low transition of the data line while the clock is high is defined as the start condition (S). A low-to-high transition of the data line while the clock is high is defined as the stop condition (P) (see Figure 5). Figure 5. Definition of Start and Stop Conditions A device generating a message is a transmitter; a device receiving is the receiver. The device that controls the message is the master, and the devices that are controlled by the master are the slaves (see Figure 6). Figure 6. System Configuration The number of data bytes transferred between the start and the stop conditions from transmitter to receiver is not limited. Each byte of eight bits is followed by one acknowledge (ACK) bit. The transmitter must release the SDA line before the receiver can send an ACK bit. 6 Submit Documentation Feedback Copyright © 2005–2008, Texas Instruments Incorporated Product Folder Link(s): PCA9546A |
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